Insulating material for embedding electrical conductors.



WITNESSES.

L. E; 'BARRINGER INSULATING MATERIAL POR EMBBDDING ELECTRICALCONDUCTORS. APPLICATION FILED mlm, 1906, RBNBWED APRA 8. 1910.

1,009,035. Patented Now/.21, 1911.

v INVENTUR- I AvvR EN EE E BARRINGER ljhllilihll) SllAllll@ lidi-f"lllilillll LAWRENCE E. BARR-INGER, OF SCHENECTDY, 'NEW' YGEK, ASSIGNQRT l?E`.l.`l'.lhlu.LV

IELECTRCOMPNY, A. CRPLELELTION 011" NEW VORM...

IlllSLiiING lYlATEBAL FR EMBEENG/ ELECTRICAL CDNDUCTCRS.

Specification of Letters laten't.

Patented Non.. 25d, Milli?,

Application filed Fem-navy 5, i906, Serial No. 299,448. Renewed April 8,1910. Serial No. 554,9369.

To 1U whomy it may concern; i

Be it known that I, LAWRENCE E. BAiniiN- one, a citizen of the UnitedSintes, residing at Seheneciedy, in J[he County of Schenectady, Staie ofNew York, have invented ceiinin new and useful linpmvemenie inInsulaiin'g Materiel for Embedding Elec* li-ical, Conductors, of whichthe following is n speeihenion.

rlhie invention relates to improvements in ineulaiing compounds and hasfoi' its ob'jeol; Jdie provision of 21 material which is :in eleotiicelinsulator of e high order in addition to being capable of withstandinga. high ieini'ieintui'e Without injury, which nl ordinary lenniei'eiuiewill be suliciently plastic o permit oi embedding :i metallic conductortherein :ind `which will hin-den under steam lieatinent.

In my pieuious application, No. 274,409, filed Mey lllh, l905, ll havedescribed and claimed e piioeees; Whei'eby ny mate "fil muy be produced.l have found, howevei, thai ihiel maeiisi'l possesses qualit-ies whichmake ih Very deoiinble :is a eiibsiance in which lo embed eleeli'iczilconductors. Ae disclosed in ihe ebovenientioned :ipplieniioin themnieiiel may be hardened undei` Steam inentineni, e pressure of 150lbs., eoi'iiesponding l'o n lenipeifniuie of 181 C., being- Sullieienito harden ii in about live hours.

li has been commonheretofore to embed ci'indiielors in' Substances suchas enamel,

which are lnsed around the conduolzoi' oi1 cementewhich 'arenir-hardened around ihe conductor. lnbennees like elaye or porci lfnncannoli be need for oi'nbedding bocaux@ of the high lenipemtnieneoesszn'y foi' hsn (lening 'which would lend to elngginn' oi: lheineinl uil'li ille innulniion. ,Enamel nino line ille disndvunlnge ofrequiring heni which renders necessary mueh caro in application. isexi'ieneive und when ooinplel'ed will nel elnnd :my great ternpeiuiuiechangesy with out munching und exposing (he eondln'loi'. lnmnelnl alsooonduol when healed, conducilifiiy beginning juni. below redness :1ndinmenging; i'fi'pidly es the ieinpei'ni'ui'e niece. '.l`hif y lends loShort eircuiting and destruciion olf he conductor. Cement:y have the,dimulvnn'lune oi lveingil noli` veux' Sirone noi denen :ind noi; being;"l-el e inslzulnlone" l'hejy' :ne elfen eneily" deeiioyi l lof" hi'eeide. Slither innieieinlss "fe been um ployed for embedding ieeistance,sind in some eases the compounds ere hardened by exposure lio Jthe nirend. by chemicals, but these compounds have been found he disinegialeand crumble and have not {hereduisile oughnees, strength, or heeti'eeietlinee, noi' een they be machined and worked inl'o the 'variety of:loiins ihfit it ie often.

desired that an insulating material. assume. l have found in hardeningmy materiel that it shrinks en amount just snfi'ieienl; to tighten n F 1Land iiinily hold a eondnctoi' in place. lhe temperature at which it' ieformed iS 16W and the inatei'inl when formed will stand a highienipeiziiui'e and is highly insulating, ni all temperatures. Theinaeirinl uf'hile e. li'emely herd and strong; cen be inziel'iined whendesirable ior Special shapes lapped foii seiews, etc.

ln carrying ouiJ my invention, the 'process used is the seme es thatdescribed in the abovementioned application. Ai qmlntity of asbestos orothei" fibioiisinnieiiel isinixed Wiih :i definite qunniiijv of calciumhydrate and flint, or eilieu. Other ineieiizile euch ne magnesiumhi'di'nl'e oi" magnesium meid. may be used, ii'` beingl onliY eeeenlinlthat neubnlunee be employed which will combine Wi'l'h Siliea lo i'oim n.silicate under steam tiene ment. it is preferable in mixingl nini'eiinleio be combined in l'hie "manner ilnil, ninounie corresponding io ihemolecular in'oi'ioi'iions be used: the nppionimnie formule oij theSilieno ioiined being` (feSiflflO. he nei'ceni'ugfe of ':itoii'fsi viiigsomewhnl. For ineinnee when slnked linie and ilini' .fne uned in hopi'onoilion of ifi lo (l0. llieie will be, no exc of eii'hel linie oi'llinl'. lhe exnei' inonoiiionn inni". howevel. he varied llnonggfhoul' ueonnideinble innige. und l have found (hul im' ceilziin (deseen of'noel( l'ho propo'iimis oi GCI nshentoe, 38C? dint und 295 calciumh'vdiziie give Vous eniiniinci'oiy i'esulls. Those ingredimin, :ililei'beine thoroughly mixed. ui'e moislened und block ot high insulatingmaterial; and Fig.

5 is an end view of the saine.

The form shown in Fig. l requires no description, since it merely showsone of the possible uses to which I l0. in the form ci a block having astud 1l connected therewith, islfirmly embedded in the material.

In Fig.. 2 I. have applied my invention to a rheostat. The resistanceconductor l2 may be embedded in the material in any desiredinanneruasfor instance, by Winding the Wire about a glas/s rod 13 andthen embedding the rods in ythe material as shown.

In Figs. l and 5 I have shown another possible arrangement. lIn thiscase I have formed a starting rheostat by embedding the rcsistances lain fthe material in the. manner shown in' F1g.-2 and .forming terininalsfor the sections o't' resista-nce by cnibedding studs'l5 after themanner shown in Fig. l. A controlling arm 16, pivoted at 1i', isarranged to successively engage the studs to vary the resista ice.

It will be seen rom the yforegoing that I have produced an insulatingmaterial which is exceedingly valuable as `an embedding substance for.metallic conductors. When hardened, it. becomes like slate or soapstoue,but has' theI advantage over these of being capable ot' lending itselfreadily to various forms by i'i'iolding vin addition t'o being/ capableot being machined.

Many modilications of my invention will vsiiggest themselves to thoseskilled, in the art, and it should be understood that I do not limit myinvention `to the materials o'r ,process ofV formingv andarranging'fsame Vherein motioned, but that all suchl medidcations wi'llcome within) the spirit of my may apply my invention. In this case ametallic conductor iboebais `invention in sofar as they falll Within thescope of the claims annexed to and forming a part of this application.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, isf- 1. A steamLhardened insulating compound having anelectrical conductor embedded therein.

2. A steamhar dened insulating compound of silica and a hydrate havingan electrical conductor embedded therein.

3. A steam-hardened insulating compound of an alkaline hydrate andsilica having a metallic conductor'embedded therein.

4. A steam-hardened insulating .conm pound ofcalcium hydrate andsilicaasso ciated With a fibrous material and an electrical conductorembedded in said compound.

5. An insulating composition of a fibrous material and hydrons silicateof calcium having an electrical conductor embedded therein. A

6. An insulating material of asbestos and hydrous silicate of :alciuinhaving an electrical conductor embedded therein.

7. A steam-hardened insulating compound of silica and anzalkaline earthmetal having an electrical conductor embedded therein.

8. A rheostat comprising a resistance conductor embedded in asteam-hardened compound.

9. A rheostat comprising a'resistance conductor embedded in asteam-hardened compound containing 'hydrous silicate of an alkalineearth.

'l0'. A rheostat comprising a resistance conductor embedded in aSteamhardened compound of silica and a hydrate.

l1'. A rheostat comprising a hydrous silicate and a heat resistingfibrous material having a resistance conductor embedded therein.

l2. A rheostat comprising a composition of hydrous silicate of calciumand asbestos having a resistance conductor embedded lth erein.

13. A rheostat comfprising a resistance conductor embedded inasteam-hardened mass ot' calcium silicate, silica and asbestos.

In Witness whereof, I have hereunto set my hand this 2nd day ofFebruary, 1906.

' LAWRENCE E. BARRINGER. liVitnesses BENJAMIN B. HULL, HnLrN OnroRD.

